effervescent UK /ˌɛfəˈvɛsənt/US /ˌɛfɚˈvɛsənt/ adjective2 •Giving off bubbles; fizzy. •(figurative) Vivacious and enthusiastic.The effervescent Suarez then went close again as he worked space for a shot after a mazy run but could not keep his close-range shot below the crossbar. — 2012 formsmore effervescent · most effervescent